Ink-jet head, ink-jet printer, and ink-jet recording method

a technology of inkjet printers and inkjet heads, which is applied in the direction of inks, printing, inks, etc., can solve the problems of inability to eject, inability to fully disable the inkjet head itself, and metal inside the head that was often corroded by water, and achieve excellent ejection stability

Active Publication Date: 2010-04-01
KONICA MINOLTA MEDICAL & GRAPHICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0032]According to the present invention, there were able to be provided an ink-jet head and an ink-jet printer enabling to inhibit occurrence of precipitates in an ink contact portion and to carry out image recording with excellent ejection stability, as well as an ink-jet recording method using the same.

Problems solved by technology

In a water-based ink-jet head commonly used, a metal inside the head was often corroded by water present in an ink.
Such corrosion often caused clogging by corroded materials in the ink-jet head, whereby, in severe cases, the ink-jet head itself was frequently disabled completely.
It has been found that these precipitates caused clogging of the ink supply path, and then reaching thereof to the nozzle section caused ejection failure.
However, with regard to a cationically polymerizable ink, when a metallic material was used as a liquid contact member of an ink-jet printer, it has been found that undesirable electrochemical reaction occurred and thereby decomposed materials or polymerized materials of ink components were generated.
It is thought that these electrically conductive members usually exhibit excellent durability to various inks such as a water-based ink-jet ink, a solvent-based ink-jet ink, an oil-based ink-jet ink, an ultraviolet radiation curable-type ink-jet ink, and a solid-based ink-jet ink; and also adversely affect such inks only to a small extent.
It was found that when any of these electrically conductive members came into contact with a polymerizable, conductive ink, undesirable electrochemical reaction occurred, whereby decomposed materials or polymerized materials of ink components were generated in a flow path or an ink-jet head.
Further, corrosion causes metal dissolution.
Especially, a cationically polymerizable actinic radiation curable-type ink-jet ink containing a photolytically acid generating agent such as an onium salt as an essential material tends to produce such a problem due to relatively high electrical conductivity of the ink.
Therefore, deposition thereof in an ink-jet head, specifically in a nozzle peripheral portion causes a decrease in ejection straightness.
In worst cases, unrecoverable nozzle clogging is caused.

Method used

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  • Ink-jet head, ink-jet printer, and ink-jet recording method
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  • Ink-jet head, ink-jet printer, and ink-jet recording method

Examples

Experimental program
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Effect test

example 1

[0306]>

[0307]

[0308]There were placed 1 part by mass of a dispersion agent (PB822, produced by Ajinomoto Fine-Techno Co., Inc.) and each of the photopolymerizable compounds listed in Table 1 in a stainless steel beaker and then dissolved via stirring and mixing over 1 hour while heated on a hot plate of 65° C. Subsequently, various pigments listed in Table 3 were added to the resulting solution and then the resulting mixture was placed in a poly bottle together with 200 g of zirconia beads of a diameter of 1 mm and tightly sealed, followed by dispersion treatment for 2 hours using a paint shaker. Subsequently, the zirconia beads were removed and various additives such as a photopolymerization initiator, a basic compound, and a surfactant were added in combinations as listed in Table 1. The resulting mixture was filtered by a 0.8 μm membrane filter to prevent printer clogging, whereby a curable composition ink was prepared. Incidentally, ink viscosity was allowed to be 20 mPa·s-30 mPa...

example 2

[0346]>

[0347][Preparation of Pigment Dispersions]

[0348](Preparation of Yellow Pigment Dispersion)

[0349]A yellow pigment dispersion was prepared based on the following method.

[0350]Two kinds of compounds listed below were placed in a stainless steel beaker and dissolved while heated and stirred on a hot plate at 65° C.

AJISPER PB822 (a dispersion agent, produced by 8 parts by massAjinomoto-Fine-Techno Co., Inc.)ARON OXETANE OXT-221 (an oxetane compound,72 parts by massproduced by Toagosei Co., Ltd.)

[0351]Subsequently, after cooling to room temperature, 20 parts by mass of C.I. Pigment Yellow 150 (E4GN-GT CH20015, produced by Lanxess AG) was added as a pigment to the resulting solution, followed by being placed in a glass bottle together with 200 parts of zirconia beads of a diameter of 0.3 mm and sealed. Dispersion was carried out using a paint shaker for 4 hours, followed by removal of the zirconia beads to prepare a yellow pigment dispersion.

[0352](Preparation of Magenta Pigment Dis...

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Abstract

Disclosed is an inkjet recording method wherein an image is formed on a recording medium by spraying an ink containing at least a photopolymerizable compound onto the recording medium through a nozzle of an inkjet head. This inkjet recording method enables to perform a stable image recording by suppressing formation of a precipitate in the head. This inkjet recording method is characterized in that in an inkjet head, which is used for forming an image on a recording medium by spraying an inkjet ink containing at least a photopolymerizable compound through a nozzle, the surface of at least a part of metals constituting the internal member of the inkjet head which is in contact with the inkjet ink is subjected to a passivation treatment or an insulation coating treatment.

Description

TECHNICAL FIELD[0001]The present invention relates to an ink-jet head used to eject an ink-jet ink containing a photopolymerizable compound, an ink-jet printer, and an ink-jet recording method using the same.BACKGROUND[0002]Over recent years, due to simple and inexpensive production of images, an ink-jet recording system has been used in a wide variety of printing fields including specialty printing such as photograph, various types of printing, marking, and color filters. Generally, a water-based ink-jet ink containing water as a main solvent is recorded onto exclusive paper with ink absorbability serving as a recording medium. There have also been put into practical use ink-jet systems, other than such a water-based one, such as a phase-change ink-jet system utilizing wax ink which is solid at room temperature; a solvent-based ink-jet system utilizing ink mainly containing a quick-drying organic solvent; and an actinic radiation curable-type ink-jet system carrying out cross-linki...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B41J2/19
CPCB41J2/155B41J2/1606B41J2/175B41J2/17509B41J11/002B41J29/02C25D11/04B41J2202/20B41M5/0023C09D11/101C09D11/322C22C21/02B41J2002/14491
Inventor ISHIKAWA, WATARU
Owner KONICA MINOLTA MEDICAL & GRAPHICS INC
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